Air conditioning apparatus



Aug. 29, 1933. Y1 l.. LANDAUER AIR CONDITIONING APPARATUS Filed Nov. 7,1932 3 Sheets-Sheet l .INIILU xf, Sw, NQWN mmv gmc/M10@ Leo L. ,La/mayerL. L. LANDAUER Y l 1,924,447

AIR CONDITIONING APPARATUS v 3 Sheets-Sheet 2 Filed Nov. 7, 1952 Aug.29, V1933.

Aug. 29, 1933.

L, 1.., L ,ANDAUER 1,924,447

R CONDITIONING APPARATUS.

Filed Nov. 7, 195:2v Y s sheets-sheet 3v /IOLr Patented ug. 29, 1933UNITED STATES PATENT OFFICE 10 Claims.

air is forced through aY conduit by means of a,

blower and pre-heated before being broughtninto contact with the primaryheating elements, the waste gases from the heating means for the primaryheating elements being utilized to heat the pre-heating means.

Another object of the invention is to provide an air conditioning unitthrough which the air is forced and the air currents kept constantly inmotion, such currents first being filtered, then pre-heated, thenheated, andiinally humidied before being discharged from the unit.

Another object of the invention is to provide a self-contained airconditioning apparatus which may be economically operated at a maximumefliciency and which Will be simple and compact.

A construction designed to carry out the invention will be hereinafterdescribed, together with other features of the invention.

The invention will be more readily understood from a reading of thefollowing specification and by 'reference to the accompanying drawingsin which an example of the invention is shown, and wherein:

Figure l is a horizontal cross-sectional view of an air conditioningapparatus constructedin accordance with the invention,

Figure 2 is a longitudinal vertical sectional view taken on the line 2-2of Figure 1, some of the portions being broken away to illustrateunderlying parts,

Figure 3 is a transverse vertical sectional view taken on the line 3-3of Figure 1, a portion of the air duct being broken away to illustrateother parts,

Figure 4 is a horizontal cross-sectional view taken on the line 4-4 ofFigure 2,

Y Figure 5 is a vertical sectional view taken on the line 5--5 of Figure4,

Figure 6 is a detail view showing the gas supply control, and.

' Figure 7 is a sectional View of the diaphragm gas valve.

In the drawings the numeral 10 designates an upright casing, preferablyof sheet metal and rectangular in shape. The casing has a lining l1 ofsuitable heat insulating material. A sheet metal duct 12 is mounted inthe casing and is given an undulating form to increase its length withinthe casing. At. the lower portion of the rear of the casing is arectangular collar 13 forming an air inlet, and airfrom any -suitablesource, either fresh kyair or circulated air or a mixture thereof, maybe introduced through this collar.

An air box 14 mounted in the bottom of the casing at the rear thereofreceives air from the collar. A suitable fan or blower 15 is mounted inthe box. The fan is driven by a belt 16 from an electric motor 17mounted in the box. The motor also drives a centrifugal water pump 19 bymeans of a belt 18. The discharge flue of the Vfan is connected to allexible boot 20 in the upper end of the box which in turn is fastenedto the collar of a transition 21 of the ue 12. The transition isattached to a return bend 22 and this is attached to the kupper end ofan elbow 23, while a sleeve 24 extends from the elbow along the bottomof the casing and through the front end of the casing and terminates ina collar 25, to which the distributing ue or conductor may be connected.The elements 21, 22, 23 and 24 constitute parts of the ue 12, whichextends vertically as well as horizontally.

At the junction of the transition 21 and the bend 22, a suitable airlter 26 is mounted transversely, so that the air currents dischargedfrom the fan must pass therethrough, whereby dust and extraneous matteris filtered out. A curved deector 2'? is mounted in the bend 22 andtends to cause a portion of the air currents to pass through the upperportion of rsaid bend.

A pre-heater 28 comprising headers 29 connected by at tubes 30 ismounted in the ue just above the elbow k23. The headers are 1ocatedoutside of the ue, while the tubes extend across the flue, and arearranged with their greatest dimensions vertically, so as to providepassages therebetween for the air currents. The vent pipe 31 of a waterheater 32 is connected to one of the headers'29, while a vent pipe 31leads from the Vother header through the side wall of the casing 10 to asuitable outlet. Waste gases and heat currents from the heater 32 passthrough the tubes 30 and heat the same, whereby the air currents passingbetween the tubes are pre-heated.

The water heater 32 is enclosed in the housing 33 which is provided witha heat insulating lining 34. The heater may be located at any suitableplace and the vent pipe extended to the pre-heater. Y

A heating unit 35 is mounted in the sleeve 24 of the flue 12 andincludes a plurality of return tubes 36 connected at their upper endswith a hot Water supply pipe 37 and at their lower ends with a dischargepipe 38. The tubes extend transversely of the flue in horizontal courseand are provided with radiating fins 39 in the path of the air currents.This gives an increased heating surface and the pre-heated air currentspassing between the heating tubes 36 are thoroughly heated.

Between the pre-heater 35 and the end Wall of the casing, a water trough40 is mounted in the bottom of the sleeve 34. An overflow pipe 4lmaintains a water level in the trough and Water is suppliedV by a pipe42 and regulated by a cock 43. Moisture is thus supplied in the sleeveto humidify the heated air currents.

It is pointed out that cold or cool air currents entering the casing areforced through the flue 12 and kept in constant motion while in thecasing. These air currents are first ltered, then pre-heated, thenheated and finally humidified while passing through the casing. Theentire conditioning of the air is accomplished in aicontinuous passagethrough a single casing and in a simple and eiiicient manner.

Water for the heaterI 32 is supplied by a service pipe 44 to a returnpipe 45, which is connected by a pipe 46 with the `bottom of the Waterheater. The pipe 45 extends from the housing 33 into the casing 10 andoutside of the flue 12 to the discharge of the pump 19 in the box 14.The discharge pipe 38 from the heater 35 is connected with a pipe 47which extends therefrom, through the trough 40 and is connected to apipe 48 on the opposite sides of the casing extending rearwardly to theinlet of the pump 19. A hot water supply pipe 49 extends from the upperportion of the water heater 32 into the casing and connects with a pipe50. The pipe 50 connects with a T 51, which is connected to the pipe 37.

It is obvious that a constant circulation of hot Water is maintainedfrom the heater 32 by way of pipes 49, 50 and 37 to the heater 35,thence by pipes 38, 47 and 48 to the pump 19 and from said pump back tothe water heater 32 by pipes 45 and 46. In order that Water of a highertemperature than 212 degrees F. may be used, the T 51 is connected by apipe 52 with an expansion tank 53 mounted in the upper portion of thecasing.` A pressure relief valve 54 is connected through the top of thecasing with the tank. A gage glass 55 on the outside yof the casing isconnected with the tank.

The heating may be automatically controlled if desired. A gas supplypipe 56 extends into the houisng 33 to the heater 32. A cut-off valve 57is connected in this pipe and the valve case 58 of a diaphragm controlvalve 59 is also connected in the pipe 56 between the valve 57 and theheater. A valve operator 60 is mounted in the housing and is connectedwith the valve 57 by a chain 61. This operator is electrically connectedwith a temperature control thermostat. located at a point (not shown) atwhich it is desired to regulate the temperature and to which conditionedair is -delivered from the device. This mechanism is common in the artand its operation is well understood.

The diaphragm valve is illustrated in Figure 7, and 'is so well-known asnot to require detailed description. Its purpose is to cut off the gassupply when the Water reaches an excessively high temperature. Athermostat 62 is inserted in the hot water pipe 50 and is provided withthe usual trip valve 63 connected in a gas line 64 which leads from thegas supply pipe 56 in advance of the valve 57 and extends to thediaphragm valve to hold the same open. The thermostat 62 controls theclosing of the valve 59, Whic'h latter is normally open. The operationof the thermostat 62 closes the valve 63 which cuts off the supply ofgas to the valve 59, whereupon the latter is closed, thus shutting offthe supply of gas to the heater 32. It is obvious that any suitablecontrol means could be used and the details thereof are not' a part ofthe invention. By circulating iced or cold water through the tubes 36and cold air through the pre-heater, or cutting out the pre-heater, anair conditioning device for summer use may be provided.

The description which has been given recites more or less detail of aparticular embodiment of the invention which is set forth as new anduseful, however, I desire it understood ,that the invention is notlimited to such exact details of construction, because it is manifestthat changes and modifications may be made within the scope of theappended claims without departing from the spirit of the invention.

What I claim and desire to secure by Letters Patent, is:

1. In an air conditioning device, a housing, an undulating flueextending through said housing, means for forcing air currents throughsaid /ue, a heater arranged adjacent the discharge end of the flue inthe path of the air currents, and a pre-heater disposed in the iiue inadvance of the heater and in the path of the air currents.

2.v In an air conditioning device, a housing, an undulating flueextending through said housing, means for forcing air currents throughsaid flue, a heater arranged adjacent the discharge end of the ue in thepath of the air currents, a

pre-heater disposed in the flue in advancev of the heater and in thepath of the air currents, and a humidifier arranged adjacent the heater.

3. In an air conditioning device, a housing, an undulating flueextending through said housing, means for forcing air currents throughsaid flue, a heater arranged adjacent the discharge end of the flue inthe path of the air currents, a pre-heater disposed in the flue inadvance of the heater and in the path of the air currents, a waterheater, a circulatory water conductor connected with the Water heaterand the air heater, and a pump connected in said conductor.

`4. In an air conditioning device, a housing, an undulating flueextending through said housing, means for forcing air currents throughsaid flue, a heater arranged adjacent the discharge end of the flue inthe path of the air currents, a pre-heater disposed in the flue inadvance of the heater and in the path of the air currents, a waterheater, a circulatory water conductor connected with the water heaterand the air heater, a pump connected in said conductor, and an expansiontank connected with the conductor, whereby water at a temperature higherthan 212 degrees F. may be circulated through the air heater.

5. In an air conditioning device, an upright casing, an air admittingbox mounted at the rear of the casing, an undulating ue extend- `ingfrom said box through the casing and having its discharge end at thefront' end of the casing, an air blower mounted in the box and connectedwith the rear end of the ue, an air heater mounted in the ue andincluding water tubes, means for supplying hot water to the tubes of theheater, anda pre-heater for the air currents mounted in the flue inadvance of the air heater.

6. In an air 'conditioning device, an upright casing, an air admittingbox mounted at the rear of the casing, an undulating iiue extending fromsaid box through the casing and having its discharge end at the frontend of the casing, an air blower mounted in the box and connected withthe rear end of the ue, an air heater ,mounted in the iiue and includingwater tubes,

means for supplying hot water to the tubes of the heater, a pre-heaterfor the air currents mounted in the flue in advance of the air heater,means for circulating the water supplied to the tubes of the heater andreturning the same to the heating means, and an expansionV tankconnected in said circulating means.

7. In an air conditioning device, a casing, a flue extending through thecasing, means for continuously forcing air currents through said flue, aheater in said ue in the path of the air currents, and a pre-heater insaid nue inthe path of the air currents mounted in advance of theheater.

8. In an air conditioning device, a casing, a flue extending through thecasing, means for continuously forcing air currents through said ue, aheater in said iiue in the path of the air currents, a. pre-heaterinvsaid nue in the pathk of the air currents mounted in advance of theheater, and heating `means for,supplying hot water to the heater andpassing hot gases through the pre-heater for heating the same.

9. In an air conditioning device, a casing, aV ue extending through thecasing, means forA continuously forcing air currents through said flue,a heater in said flue in the path of the air currents, apre-heater insaid flue in theVV path of the air currents mounted in advance of theheater, a water heater, a circulatory water conductor connected with theheater and the water heater and including a pump, means for supplyingfuel to the water heater, and

Athermostatically controlled means for regulating the fuel supply.

10. In an air conditioning device; a casing;

an air admitting box at the rear of the casing;

